Which of the following was mentioned by the text as one of the two important criteria for a diagnosis of a clinical mood disorder?

A) substance abuse
B) chemical imbalance in the brain
C) implications
D) presence of dependent personality disorder
E) duration

The text mentions that duration is one of the two important criteria for a diagnosis of a clinical mood disorder, along with the presence of a certain number of symptoms. Substance abuse, chemical imbalance in the brain, implications, and dependent personality disorder may be relevant factors in the development or exacerbation of mood disorders, but they are not explicitly mentioned as criteria for diagnosis.